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• ffmpeg produces video with misaligned frames

  28 mars 2023, par massivemoisture

  I have a WPF app that uses DeckLinkAPI to stream video from Blackmagic capture card (similar to their 'CapturePreviewCSharp' sample project, which can be found here : https://www.blackmagicdesign.com/developer/)

  


  'VideoInputFrameArrived' method is called when a video input frame arrives :

  


  void IDeckLinkInputCallback.VideoInputFrameArrived(IDeckLinkVideoInputFrame videoFrame, IDeckLinkAudioInputPacket audioPacket)
{
    if (videoFrame != null)
    {
        CurrentFrame = videoFrame;
        VideoFrameArrived?.Invoke(this, new DeckLinkDeviceInputVideoFrameEventArgs(videoFrame));
        GC.AddMemoryPressure(videoFrame.GetRowBytes() * videoFrame.GetHeight());
    }
}


  


  I want to record the stream to a file. So I open a ffmpeg process with these arguments :

  


  // My source is 1080p
string args = $".\\ffmpeg.exe -y -f rawvideo -pix_fmt bgra -s 1920x1080 -r 30 -i - -c:v libx264 -preset ultrafast -pix_fmt yuv420p -crf 23 \"{outputFilePath}\"";


  


  And I write to ffmpeg's pipe :

  


  // ffmpegInputStream = FfmpegProcess.StandardInput.BaseStream
public void WriteVideoFrameToProcessStream(Stream ffmpegInputStream)
{
    while (true)
    {
        if (isRecording == true)
        {
            if (ffmpegInputStream != null)
            {
                // Convert the frame to BGRA32 format and convert the video frame to a byte array
                byte[] frameData = ConvertVideoFrameToByteArray(CurrentFrame);
                // Write the frame data to the ffmpeg input stream
                ffmpegInputStream.Write(frameData, 0, frameData.Length);
            }
        }
    }
}


  


  But the video file output has misaligned frames. The frame looks like it has been shifted to the left. 1/5 of the frame on the right is supposed to be on the left.


  


  I tried saving the frameData byte array in WriteVideoFrameToProcessStream to an image file and it looks fine. What could be wrong here ?

  


• "Output stream closed" when streaming PassThrough stream to AWS using @aws-sdk/lib-storage

  5 avril 2023, par cjd

  I am attempting to stream a PassThrough stream directly to S3 using @aws-sdk/lib-storage.

  


  My upload function is :

  


  const uploadStreamToS3 = () => {
    const Key = 'test.mp4';
    const Bucket = 'bucket-name';
    const stream = new PassThrough();
    const upload = new Upload({
        client: s3Client,
        params: { Bucket, Key, Body: stream },
        tags: [], // optional tags
        queueSize: 4, // optional concurrency configuration
        partSize: 1024 * 1024 * 5, // optional size of each part, in bytes, at least 5MB
        leavePartsOnError: false // optional manually handle dropped parts
    });
    return {
        stream,
        uploadComplete: upload.done(),
        upload
    };
};


  


  I am piping from ffmpeg directly to the PassThrough stream :

  


          ffmpegInstance
            .addOutputOptions(
                '-movflags +frag_keyframe+separate_moof+omit_tfhd_offset+empty_moov'
            )
            .format('mp4')
            .pipe(stream, { end: true });


  


  When I run this locally, everything works.

  


  I am using a container lambda function with Docker.

  


  If I run the Docker container locally, everything works as expected. If I run the same code on Lambda, I get the following error Output stream is closed.

  


  One work around is to write the file to the Lambda tmp folder using a writeStream and once the file is written I can stream the file to S3 using a readStream as the Body of new Upload. However, I would like to stream directly to S3 and not create this temporary file in Lambda.

  


  Is this possible ? Is the issue with using a PassThrough stream in the Body for S3 ?

  


• flient-ffmpeg getting error as "ffmpeg exited with code 1 : pipe:0 : Invalid data found when processing input"

  6 avril 2023, par Abhishek Rawal

  I am trying to create API where i need to get uploaded video and create thumbnail from that video. But conditions are :

  


  

  • Video should not store on local disk

  


  • Once thumbnail is create it should not store on local disk, instead it should directly uploaded to AWS s3 bucket.

  


  


  Following is the code i am trying with :

  


  


  


  const ffmpeg = require('fluent-ffmpeg');
const stream = require('stream');

router.post('/thumbnail', upload.any(), (req, res) => {
  const videoBuffer = req.files[0].buffer;
  
  let readableVideoBuffer = new stream.PassThrough();
    readableVideoBuffer.write(videoBuffer);
    readableVideoBuffer.end()
    
  let bufferStream = new stream.PassThrough();
  
  ffmpeg(readableVideoBuffer)
    .on('filenames', function(filenames) {
      console.log('Will generate ' + filenames.join(', '))
    })
    .on('end', function() {
      console.log('Screenshots taken');
    })
    .on('error', (err) => {
      console.log(err);
    })
    .screenshots({
      count: 4,
      size: '100x100',
      timestamps: ['00:00:01.000'],
    })
    .writeToStream(bufferStream, { end: true });  /* while using this statement i am getting error */
    
    const buffers = [];
    bufferStream.on('data', function (buf) {
      buffers.push(buf);
    });
    bufferStream.on('end', function () {
      const outputBuffer = Buffer.concat(buffers);
      // use s3 bucket code here
      console.log('outputBuffer===========>', outputBuffer)
    });
})

  


  


  



  so while calling this API my app is crashing and i am getting error as :

  


  


  Error : ffmpeg exited with code 1 : pipe:0 : Invalid data found when
processing input

  


  


  Blockquote

  


  If i am not using this statement :

  


  


  .writeToStream(bufferStream, end : true ) ;

  


  


  then able to save file but in local disk, which is not required in my case.

  


  Please help me to understand what is wrong in this code, how i can resolve it.
Any type of help is appreciated.